장기표면의 내외봉한관과 봉한소체의 형태학적 관찰

안성훈 ( Seong Hun Ahn ),김민수 ( Min Su Kim ),이상훈 ( Sang Hun Lee ),권오상 ( O Sang Kwon ),김재효 ( Jae Hyo Kim ),소광섭 ( Kwang Sup Soh ),손인철 ( In Chul Sohn ) 대한경락경혈학회 2009 Korean Journal of Acupuncture Vol.26 No.1

Objective: In 1960`s Bonghan Kim`s team found BongHan(BH) ducts which were presumed as acupuncture meridians and BH corpuscles. They asserted Bonghan theory and SanAl theory which was involved in cell division and cell restoration. However, many other experiments which had been operated to demonstrate and find the existence of BH ducts had failed because of the secret of blue stain drugs. During the last several years, BongHan theory has been revived through experimental researches to find the anatomical structures of BH ducts and corpuscles by Soh`s Biomedical Physics Lab. Soh`s research team used the staining with Janus Green B, Alcian blue, nanoparticles and Acridine Orange. We used DAPI staining to find the existence of BH ducts and the corpuscles and to observe nuclear arrangement. Methods: We used japan white rabbits as experimental animals. BH ducts and corpuscles were stained with DAPI. The nucleus configuration in BH ducts stained with DAPI were observed with microscope. Results: In this study, we found thread like structures in silver white color distinguished from the blood vessels, nerves and lymph vessels. These thread like vessels in the linear duct shape were connected to same colored mass in the ball shape. Thread like structures we found could be separated easily from the surrounding other organ mass. The nuclei of the thread like structure in DAPI staining, are about 10~20㎛ length, in rod shape and linear arrangement. Conclusion: We concluded that the thread like structure we found was same vessel reported by Soh`s research team, BongHan ducts and corpuscle.

SIZE OPTIMIATION OF AN ENGINE ROOM MEMBER FOR CRASHWORTHINESS USING RESPONSE SURFACE METHOD

S. OH,B.-W. YE,H.-C. SIN 한국자동차공학회 2007 International journal of automotive technology Vol.8 No.1

The frontal crash optimization of an engine room member using the response surface method was studied. The engine room member is composed of the front side member and the sub-frame. The thicknesses of the panels on the front side member and the sub-frame were selected as the design variables. The purpose of the optimization was to reduce the weight of the structure, under the constraint that the objective quantity of crash energy is absorbed. The response surface method was used to approximate the crash behavior in mathematical form for optimization procedure. To research the effect of the regression method, two different methodologies were used in constructing the response surface model, the least square method and the moving least square method. The optimum with the two methods was verified by the simulation result. The precision of the surrogate model affected the optimal design. The moving least square method showed better approximation than the least square method. In addition to the deterministic optimization, the reliabilitybased design optimization using the response surface method was executed to examine the effect of uncertainties in design variables. The requirement for reliability made the optimal structure be heavier than the result of the deterministic optimization. Compared with the deterministic optimum, the optimal design using the reliability-based design optimization showed higher crash energy absorption and little probability of failure in achieving the objective.

Fast motion estimation using modified diamond search patterns

So, H.,Kim, J.,Cho, W.-K.,Kim, Y.-S. IEE 2005 Electronics letters Vol.41 No.2

A fast block motion estimation algorithm is proposed using modified diamond search patterns. This algorithm utilises the directions and magnitudes of motion vectors between interblocks and uses a smaller number of search points than conventional diamond search patterns. Simulation results show that the proposed method significantly improves computational speed over other fast motion estimation algorithms without degradation of distortion.

New approaches for micro-controlling of oxygen dopant contents in silicon-based thin films with application to multi-band gap solar cells

So, H.,Jang, J.,Lee, D.,Hong, M. Elsevier 2012 CURRENT APPLIED PHYSICS Vol.12 No.suppl4

Using the neutral-beam-assisted chemical vapor deposition (NBaCVD) system [5-12], an alternative technique that can control the oxygen doping in a silicon-based thin film has been developed. This brand-new technique has the ability to controlling of optical band gaps by micro-control the oxygen dopant concentrates in the nc-Si thin films. This control of the oxygen doping results in self-biasing on the internal antenna of an inductively coupled plasma (ICP) source; it also results in the hydrogen neutral beam (NB) energy being adjusted by the reflector bias. The oxygen atoms are supplied from the sputtering of an internal ICP antenna covered by a quartz tube and are eliminated by the energetic hydrogen NB in the NBaCVD system, rather than by a mass-flow-controller (MFC) used in conventional CVD. These results are observed via Fourier Transform Infrared Spectroscopy, X-ray Photoelectron Spectroscopy, Secondary Ion Mass Spectroscopy and UV-visible data. The result of this experiment allows the fabrication of multi-junction solar cells with gradually varying optical band gaps.

Caving Disaster and Oil Spill Removal Adsorbent Mag-Sorbent

Soh, Dea-Wha,Soh, Hyun-Jin,Soh, Hyun-Jun,Soh, Hyun-Jae The Speleological Society 2008 동굴 Vol.85 No.-

For trying to frontal attack of new solution by fusion of technical tasks and conditions with it's solving methods of the essential tasks of marine resource development and environmental conservation in addition with elements of electronic high-technologies, the magnetic oil spill adsorbent of Mag-Sorbent* has been prepared and proposed to dispose oil spill from the marine disaster for preventing oil pollution by using them and their system with sequentially circular collection of oil spill mag-sorbent powder and fabrics on the electronic equipment like as barge robot for the scheme of sustainable development of environment-friendly technology. Because of recent marine accident occurred at Tae-An cost and earthquake in Sichuan province were very large scale accident of disaster to prevent and manage of them. So, it was verified from the experiment of electronic demonstrator that the skimmer system of oil spill mag-sorbent powder and fabrics prepared was very effective and useful technique to collect oil spill samples on the water surface specially at the closed space of underground cave. At this point, the barge-based electronic remote control was very useful system operating easily on the marine fields but also water level at the small pool to skim it with the environment-friendly system of the disposing marine disaster and preventing oil pollution using magnetic adsorbents of Mag-Sorbent*.

Caving Disaster and Oil Spill Removal Adsorbent Mag-Sorbent

( Dea Wha Soh ),( Hyun Jin Soh ),( Hyun Jun Soh ),( Hyun Jae Soh ) 한국동굴학회 2008 동굴 Vol.85 No.-

For trying to frontal attack of new solution by fusion of technical tasks and conditions with it`s solving methods of the essential tasks of marine resource development and environmental conservation in addition with elements of electronic high-technologies, the magnetic oil spill adsorbent of Mag-Sorbent* has been prepared and proposed to dispose oil spill from the marine disaster for preventing oil pollution by using them and their system with sequentially circular collection of oil spill mag-sorbent powder and fabrics on the electronic equipment like as barge robot for the scheme of sustainable development of environment-friendly technology. Because of recent marine accident occurred at Tae-An cost and earthquake in Sichuan province were very large scale accident of disaster to prevent and manage of them. So, it was verified from the experiment of electronic demonstrator that the skimmer system of oil spill mag-sorbent powder and fabrics prepared was very effective and useful technique to collect oil spill samples on the water surface specially at the closed space of underground cave. At this point, the barge-based electronic remote control was very useful system operating easily on the marine fields but also water level at the small pool to skim it with the environment-friendly system of the disposing marine disaster and preventing oil pollution using magnetic adsorbents of Mag-Sorbent.

Parameter Study of Boiling Model for CFD Simulation of Multiphase-Thermal Flow in a Pipe

Soh-Myung Chung,Yong-Seok Seo,Gyu-Mok Jeon,Jae-Won Kim,Jong-Chun Park 한국해양공학회 2021 韓國海洋工學會誌 Vol.35 No.1

The demand for eco-friendly energy is expected to increase due to the recently strengthened environmental regulations. In particular, the flow inside the pipe used in a cargo handling system (CHS) or fuel gas supply system (FGSS) of hydrogen transport ships and hydrogen-powered ships exhibits a very complex pattern of multiphase-thermal flow, including the boiling phenomenon and high accuracy analysis is required concerning safety. In this study, a feasibility study applying the boiling model was conducted to analyze the multiphase-thermal flow in the pipe considering the phase change. Two types of boiling models were employed and compared to implement the subcooled boiling phenomenon in nucleate boiling numerically. One was the "Rohsenow boiling model", which is the most commonly used one among the VOF (Volume-of-Fluid) boiling models under the Eulerian-Eulerian framework. The other was the "wall boiling model", which is suitable for nucleate boiling among the Eulerian multiphase models. Moreover, a comparative study was conducted by combining the nucleate site density and bubble departure diameter model that could influence the accuracy of the wall boiling model. A comparison of the Rohsenow boiling and the wall boiling models showed that the wall boiling model relatively well represented the process of bubble formation and development, even though more computation time was consumed. Among the combination of models used in the wall boiling model, the simulation results were affected significantly by the bubble departure diameter model, which had a very close relationship with the grid size. The present results are expected to provide useful information for identifying the characteristics of various parameters of the boiling model used in CFD simulations of multiphase-thermalflow, including phase change and selecting the appropriate parameters.

Antibacterial activity by ZnO nanorods and ZnO nanodisks: A model used to illustrate “Nanotoxicity Threshold”

Soh Fanny Chiat Orou,Kee Jeik Hang,Myo Thuya Thien,Ying Yuet Lee,Le Cheng Foh,Nguyen Duong Ngoc Diem,Goh Boon Hee,Pung Swee Yong,Pung Yuh Fen 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.62 No.-

Many studies suggested that waste water treatment using metal oxide nanoparticles, in particular the zinc oxide nanoparticles, appears to be an economical and efficient solution. However, antibacterial activities reported from various research groups were often confusing and contradicting. The present study aimed to evaluate the antibacterial effects and the underlying mechanisms on the custom-engineered Zinc oxice (ZnO) nanorods and ZnO nanodisks. Firstly, antibacterial activities of ZnO nanorods and ZnO nanodisks were studied on both Gram positive and Gram negative bacteria. The antibacterial performance of these ZnO nanoparticles were bench marked with titanium dioxide nanoparticles (TiO2). In antibacterial susceptibility assay, both types of ZnO nanoparticles showed potent inhibition on Bacillus subtilis (B. subtilis) and Staphylococcus aureus (S. aureus) with minimal inhibitory concentration (MIC) at 128 and 256 ug/ml, respectively. Nevertheless, no inhibition was found against Gram negative bacteria. Interestingly, no inhibition was found against both Gram positive and Gram negative bacteria for TiO2 nanoparticles, and thus TiO2 nanoparticles were omitted in the subsequent study. In the time-kill kinetics assay, the inhibitory effect of both types of ZnO nanoparticles on B. subtilis was significant as early as 90 min after treatment at 128 μg/ml. Besides different types of bacteria, generation of reactive oxygen species (ROS), surface area, surface charges, polarity were also examined. Our study suggested that the antibacterial effects of ZnO nanorods and ZnO nanodisks were mediated through not one but multiple chemical and physical properties of nanoparticles. This is the first report introducing a new concept on ‘Nanotoxicity Threshold’, i.e. the maximal tolerance level in bacteria before any damage manifested. Our study warrants that a more holistic view on the mechanistic insights of nanoparticles is required to minimize adverse health effect on human.

The Investigation of Pronounciation of Primary School Students

Soh, Jin Myung,Park, Sung Joon,Kim, In Sool 대한이비인후과학회 1972 대한이비인후과학회지 두경부외과학 Vol.15 No.1

Grating Coupler Design of an Integrated HAMR Head Light Delivery System Using Topology Optimization

Soh, Hyun-Jun,Yoo, Jeonghoon IEEE 2010 IEEE transactions on magnetics Vol.46 No.6

<P> This research is objected to design the grating structure for the purpose of efficient light delivery for the heat assisted magnetic recording (HAMR) system. The parameter study is firstly performed to determine the proper size of waveguide components and the topology optimization method is employed to design the grating structure. The formulation of the optimization problem is set to maximize the efficiency of the optical delivery. In the topology optimization result, the coupling efficiency is improved more than 20 times in comparison with the initial coupling efficiency and it is verified that the suggested optimization process can be applied to the grating structure design in the HAMR head effectively. </P>